Add argument to pass elastic overscroll delta to Blink (Blink side)

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef WebViewImpl_h
 #define WebViewImpl_h
 
 #include "core/page/EventWithHitTestResults.h"
 #include "platform/geometry/IntPoint.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/heap/Handle.h"
+#include "public/platform/WebFloatSize.h"
 #include "public/platform/WebGestureCurveTarget.h"
 #include "public/platform/WebLayer.h"
 #include "public/platform/WebPoint.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebSize.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebVector.h"
 #include "public/web/WebInputEvent.h"
 #include "public/web/WebNavigationPolicy.h"
 #include "public/web/WebView.h"
@@ skipping 65 matching lines @@
 
     // FIXME(bokan): Old pinch path only - This should be removed once old pinch
     // is removed.
     virtual void applyViewportDeltas(
         const WebSize& scrollDelta,
         float pageScaleDelta,
         float topControlsDelta) override;
     virtual void applyViewportDeltas(
         const WebSize& pinchViewportDelta,
         const WebSize& mainFrameDelta,
+        const WebFloatSize& elasticOverscrollDelta,
+        float pageScaleDelta,
+        float topControlsDelta) override;
+    // TODO(ccameron): Remove this when all callers are removed.
+    virtual void applyViewportDeltas(
+        const WebSize& pinchViewportDelta,
+        const WebSize& mainFrameDelta,
         float pageScaleDelta,
         float topControlsDelta) override;
     virtual void mouseCaptureLost() override;
     virtual void setFocus(bool enable) override;
     virtual bool setComposition(
         const WebString& text,
         const WebVector<WebCompositionUnderline>& underlines,
         int selectionStart,
         int selectionEnd) override;
     virtual bool confirmComposition() override;
@@ skipping 618 matching lines @@
     float m_topControlsLayoutHeight;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif